Method of making press-rolls.



H. PARKER. METHOD OF MAKING PRESS ROLLS.

, HOW/4R0 PAR/(5R;

ETER8 co., WASHINGTDN, I:v c4

HOWARD PARKER, OF NASHUA, NEW HAMPSHIRE, ASSIGNOR- TO IMPROVED PAPER MACHINERY COMPANY, OF NASI-IUA, NEW HAMPSHIRE, A CORPORATION OF MAINE.

METHOD OF MAKING PRESS-ROLLS.

Specification of Letters Patent.

Patented Oct. 18, 1910.

Application filed January 20, 1910. Serial No. 539,054.

To all whom it may concern:

Be it known that I, HOWARD PARKER, a citizen of the United States, and a resident of Nashua, in the county of Hillsboro and State of New Hampshire, have invented certain new and useful Improvements in Methods of Making Press-Rolls, of which the following is a specification.

This invention relates to the manufacture of press rolls which are used in various manufacturing operations, the roll herein described being designed especially for use in pulp and paper manufactories.

Rolls made in accordance with this invention are designed to take the place of the wooden rolls heretofore used which have been turned up out of a solid block of wood. These old solid rolls are diflicult to obtain to-day in the required sizes; they are also apt to splinter and as they are used in places where they are continually subjected to action of water or other fluids they are very apt to crack and become useless. In these solid rolls the grain of course runs lengthwise of the roll, making the surface of the roll softer than would be the case if the grain of the wood extended radially of the rol Figure 1 is a side elevation partly in section of a roll made in accordance with my invention. Fig. 2 is an end view of the same. Fig. 3 is a detail transverse section on enlarged scale with one of the binding rings broken away and showing the parts in position ready, for the last step of the process. Fig. t is a view similar to Fig. 3 but showing the finished roll.

By the invention which will now be described I am enabled to build up a. roll having a metallic or a similar rigid core and a solid continuous and uniform surface which will retain its shape under all usual conditions of use. In building up a roll according to my invention I make use of a rigid metallic core a. To one end of this core I secure an end-ring 5 through which pass binding-rods c which extend lengthwise of the core. ledge-shaped blocks of wood or other suitable eXpansible material (Z, which for convenience will be referred to as sectors, are seated on the core and arranged end to end in such a way that the completed covering appears to be made up of a number of annular sections, each section being composed of a number of these wooden sectors. The sectors as they are assembled on the core are in their normal unexpanded condition and the inner corners of the sectors of each annular section are located near to and preferably just in contact with each other, while the outer corners are separated by a considerable space. The opposing ends of these sectors are oppositely recessed as at e to form a seat on which the binding-rods rest. At intervals throughout the length of the roll binding rings f are placed between the adjacent annular sections, these bindingrings having a bearing on the core, and apertures through which the binding-rods pass. An end-ring is secured to the opposite end of the core and receives the binding-rods. By means of nuts on the ends of the bindingrods the annular sections can be securely clamped between the end-rings. The roll as thus built u 3 is now submerged in water and left there for a sufficient length of time to allow the sectors to expand as much as possible. The annular sections being clamped together by the binding rods without allowing for the expansion of the sectors lengthwise of the roll, it will be seen that the sectors as they swell or expand are under a heavy compression which insures the complete closure of all spaces between these annular sections.

The size of the sectors is such that their combined arcs when in normal unexpanded condition are less than the finished circumference of the roll and when expanded greater than the finished circumference of the roll. It results therefore that in this expanding movement due to the immersion of the roll in water the spaces between the sectors of each annular section are completely filled and the sectors are under a heavy compression circumferentially. This insures that all spaces between the ends of the sectors of each annular section are completely closed.

The binding-rings prevent the buckling of the binding-rods and because of the wedgeshape of the sectors tend to clamp them firmly onto the core during the expanding operation.

After the roll has been submerged for a sufficient length of time to insure the expan sion of the sectors to the limit it is removed and its surface turned down and smoothed off. As thus built it is in the condition in which it is to be used so that the effect of the Water which comes in contact with it during its use will not injure the surface of the roll in any way, but on the other hand tends to keep it in its proper condition.

I claim The herein described method of providing a covering for a rollvhaving a rigid core which consists in locating upon said core,

10 and adjacent to one another, members of expansible material; fixing said members in relative radial and lengthwise position; and subjecting them to conditions tending to produce expansion, whereby said members are put under a compression strain of both 15 circumferential and lengthwise character. HOWARD PARKER.

Vitnesses B. A. PEASE, ELEANORE Pnasn. 

